Observation of a 4-spin Plaquette Singlet State in the Shastry-Sutherland compound SrCu2(BO3)2

Abstract

The study of interacting spin systems is of fundamental importance for modern condensed matter physics. On frustrated lattices, magnetic exchange interactions cannot be simultaneously satisfied, and often give rise to competing exotic ground states. The frustrated 2D Shastry-Sutherland lattice realized by SrCu2(BO3)2 is an important test to our understanding of quantum magnetism. It was constructed to have an exactly solvable 2-spin dimer singlet ground state within a certain range of exchange parameters and frustration. While the exact dimer state and the antiferromagnetic order at both ends of the phase diagram are well known, the ground state and spin correlations in the intermediate frustration range have been widely debated. We report here the first experimental identification of the conjectured plaquette singlet intermediate phase in SrCu2(BO3)2. It is observed by inelastic neutron scattering after pressure tuning at 21.5 kbar. This gapped plaquette singlet state with strong 4-spin correlations leads to a transition to an ordered Neel state above 40 kbar, which can realize a deconfined quantum critical point.

6 pages, 4 figures

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• Phase Diagram of the quadrumerized Shastry-Sutherland Model
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• First order transition between magnetic order and valence-bond order in a 2D frustrated Heisenberg model
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• A Novel Ordered Phase in SrCu2(BO3)2 under High Pressure
• Competing Spin-Gap Phases in a Frustrated Quantum Spin System in Two Dimensions
• Continuous and Discontinuous Quantum Phase Transitions in a Model Two-Dimensional Magnet
• Correlated decay of triplet excitations in the Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)${}_2$
• Phase transitions in the Shastry-Sutherland lattice
• Identifying topological order in the Shastry-Sutherland model via entanglement entropy

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